Electric hammer.



PATENTED APR. 24, 1906.

W. E. WERNER. ELECTRIC HAMMER.

APPLICATION FILED SEPT. 9, 1905.

www.. *wmv neck 38. The push-button 36 hasy a contracted stem 39, which enters theend of a tubular plunger 40, 'fitted to reciprocate within the neck 38. The tubular plunger 40, of insulating material, carries a subplunger'or contact-support 41, the contracted neck 42 of which reciprocates within a hole 43 in the end of the hollow plunger 40. The contracted stem 42 has an annular shoulder 44 or cap at its outer end, and between this cap and the end of the hollow plunger 40 there is located a f spring 45. There is also a spring 46 located between the inner face of the push-button 36 and the inner end of the socket 37, in which the push-button works.; The subplunger or contact-support 41 has fixed thereon two spring-contacts 47 and 48, so arranged as to engage with a close sliding contact, the contacts 34 and 33, respectively, when the push-button 36 is forced inwardly.

The manner in which the electrical connections are made will be understood by reference to the diagram Fig. 2, where 49 represents conventionally any suitable generator and 50 a commutator provided with an insulated segment 51, the switch which has been described in detail hereinabove as located v within the handle being shown conventionally at 52 and the contact-rings in the insulat-- ing-piece 2O being indicated by the numerals 21, 22, and 23, as in Fig. 1, it being understood that their corresponding contact-pieces in the disk 24 communicate with wires to the switch within the handle and to the commutator exterior to the handle, the said wires passing from the disk 24 along a conduit 52* within the handle to the chamber 29 and thence through an opening`53 in the cappiece 54 at the end of the handle opposite the push-button 36. The positive pole of the coil 5 is connected by a wirc'55 with the contact-ring 22 and thence by wire 56 to one of the brushes 57 on the comn'lutator. The positive pole of the coil 6 is connected by a wire 58 with. the contact-ringr 2l and thence by a wire 59 to the other brush 58* on the commutatore. The negative poles of both ycoils 5 and 6 are connected by a wire 60 with the contact-plate 23 and thence by a Wire 61 with the binding-post 32 within'y the handle, thence through the switch to the bindingpost 31, thence along wire 62 to one pole 63 of the generator, and from the opposite pole 64 of the generator by a wire. 65 with the axis of the commutator 50.

It is assumed that the commutator 50 has a rotary motion imparted to it in any wellknown or approved manner and with such speed as may be required to impart to the hammer the necessary number ot' impulses per minute.

ln operation, assuming' the parts to be in the position shown in Fig. l, the coil 6 is energized, tending to draw the hammer proper, 1, back toward the handle. Asg'soon as the hammer is drawn back the commutator 50 will have rotated into position to bring the brush 58* on the insulated portion 51 and throw the brush 57 into contact to establish circuit through the wire and ring 22 with wire 55, thereby energizing the coil 5 and causing the hammer proper, 1, to advance and deliver its blow on the reduced portion 11 of the tool-shank. As soon as the blow is delivered the commutator will again have cut in the circuit through the coil 6, energizing it and vcausing a withdrawal of the hammer from the tool. ergized because of its being wound in the opposite direction from the coil 5 it will reverse the polarity in the hammer 1 from that induced by the coil 5 and in so doing will set up between the shank of the tool and the hammer proper a repulsion which will cause the hammer to not only leave the tool-shank', but be repelled therefrom. This action upon the tool-shank is emphasized b'y causing the hammer, which is made of material highly sus- The moment the coil 6 is en-l ceptiblc to magnetic influence, to surround the tool-shank for a considerable distance, the tool-shank itself being also of material highly susceptible to magnetic influence save only its hardened end; By hardening the end of the tool-shank it is caused to momentarily hold themagnetism, thus facilitating the operation of the tool.

The action of the switch within the handle is as follows: When the push-button is pressed inwardly, it carries with it the plunger 4() and the subplunger 41, closing the contact-pieces 34 33 and completing the vcircuit for starting the hammer. When pressure is removed from the push button 36, its actuatingspring 46 will force it outwardly, the ear y partrof its movement bein idle as far as the subplunger 41 is concerne as it is intended that the friction between the contact-pieces shall be sufficient to more than equal the tension of the spring 45 when in its' expanded )osition As soon, however, as the spring 45 has been compressed su Hlciently to overcome the friction between the contact-pieces the contact-pieces 47 and 48 will begin to slide on the pieces 34 and 33, and this motion once begun will be completed with great cclcrit by the action of the spring 45,'which wil throw the subplunger, with its contactpieces, prom tly away from thcY contact 34 33. This e ectually prevents the burning out of the contacts and also serves to promptly sto the hammer, and so economize energy.

is obvious that changes might be resorted to in the form and arrangement of the several parts without departing from the spirit and scope of my invention. Ilence l do not wish to limit myself strictly to the structure herein shown and described; but

What I claim is#- 1. An electric hammer comprising successive coilsrlwound in opposite directions, a

IOO

l in the coi s gizing the coils.l

hammer roper arranged to reciprocate Within the coi s, a tool having its shank projected Within the hammer and means for energizing and denergizing the coils.- l

v2. An electric hammer comprising successive coils' wound in opposite directions, a hammer roper arranged to reciprocate within the co1 s, and provided with a socket in its end for receivin a tool-shank 'and means for energizing and energizing ythe coils.

3. An electric hammer comprising successive coils woundV iny opposite` directions,` a

Vhammer proper arranged to reciprocate within the coils and provided with sockets in its opposite ends, one for receiving a tool-actuating stem or shank and one `for receiving a spring, a s rin arranged vto enter said socket in one en of t e hammer and means for energizing and denergizingthe coils.

4. An electric hammer comprising successive coils wound in opposite directions, a hammer roper arran ed to reciprocate withand provi ed with a socket for receiving a tool-shank, a wearing-button located in said socket,.a 'tool-shank arranged to enter the socket and rovided with a hardened end to receive t e impact ofthe hammer and for momentarily `holding the magnetism and y'means for energizing and dener- 5. An electric casingufor the coils, a tool-holder, engaged with the casing at one fend, a handle enga ed Withthe casing at the opposite end, a ol-- lower of' non-magnetic material interposed between the handle and coils, a hammer proper arranged to reciprocate the coils and provided witha socket in its end toergizing the coils.

. tric energy. hammer comprising siiccessive -coils rwound' in opposite directions, ,a

and source of electric energy forenergizing and denergizing the coils.

7. An electric hammer com rising a plurality of coils suitably arrange within a casing, a hammer proper arran ed to reciprocate within the coils, a ho ow handle at,-

tached to the casing, an electric switch lo-` catedwithin the handle said ,switch comprising a s ring-actuatedplunger under I.the control o the operator and a spring-actuated ,subplun er carried by the said plunger, a source oI electric energy and contact-pieces within the Ahandlein position to be connected and disconnected by the subplunger, sai

contact-pieces'bein Aconnected the one with ,the coils and the ot er with a source Iof elec- 'In .testimony that -claim the foregoing as I my inventioLn I have si ed my name in presence of two Witnesses t ',s`7th day of September, 1905. u

*y WlLLIAM WEGNER.

Witnesses: 1

FREDK. HAYNES., HENRY- .'1`rirnimfi.` 

